Horizontal line clamp for copper block coarsening

The utility model relates to a horizontal line clamp for copper block coarsening, which comprises a support plate. The support plate is provided with blind grooves of at least two sizes; the length of each blind groove is larger than or equal with the length of a to-be-coarsened copper block; and the bottom of each blind groove is provided with a through hole whose size is smaller than the size of the to-be-coarsened copper block. According to the horizontal line clamp for copper block coarsening, the support plate is a plate with a single layer and is thin, plate clamping is not likely to happen when the horizontal brown oxide line is passed; the blind grooves have at least two sizes, the to-be-coarsened copper blocks of different sizes can be put in at the same time for passing the horizontal brown oxide line, the clamp does not need to be made into different sizes according to copper blocks of different sizes, applicability is good and the cost is low.